Muffler



.Pune-15, 1937. L. L. HAAs 2,083,840

. MUFFLER n Filed Jan, le, 1955 /M/E/v ro@ Patented June 15, 1937 PATENT GFFICE MUFFLER Lucien L. Haas, Buffalo, N. Y., assigner to Buffalo Pressed Steel Company, Buffalo, N. Y.

Application January 18, 1935, Serial No. 2,388

2 Claims.

This invention relates to improvements in mufllers of the kind employed for silencing the exhaust gases discharged from internal combustion engines.

The objects of this invention are to provide a mufller of this kind with certain improvements whereby the end portion of an exhaust or tail pipe extending into the muffler may be supported in a novel manner for increasing the strength of the mufller and tail pipe assembly and for utilizing this construction for increasing the silencing effect of the muffler; also to provide a muffler oi this kind in which a baille is provided which supports the end of the pipe in fixed relation to the muffler and which is spaced at a distance from the adjacent end of the mufller for forming a structural support for the pipe and a chamber through which gases pass for silencing exhaust noises; also to improve the construction of mufflers of this kind in other respects hereinafter specified.

In the accompanying drawing:

Fig. 1 is a longitudinal central sectional View of a muffler embodying this invention.

Fig. 2 is a transverse sectional elevation thereof, on line 2 2, Fig. 1, and on an enlarged scale.

This invention is shown in the accompanying drawing as applied to a mufller of a well known type, but it will be understood that it is not intended to limit this invention to the particular type of muiller shown, since it will be obvious that the principles embodied in this invention may be applied to muiilers of different types and shapes.

A represents the exhaust pipe which leads from the exhaust manifold of an engine to the muffler and B represents the tail pipe through which gases are discharged from the muffler to the atmosphere. The mufller may have an outer housing of any desired shape or form and the exhaust and tail pipes communicate with the opposite ends of this housing. Preferably the housing comprises a shell 4 and heads 5 and 6 suitably secured to the shell, for example, by welding.

5 The heads are provided with openings with which the pipes connect. The improvements embodying this invention are, in the construction illustrated, provided at both ends of the muffler, but

50 it will be understood that only one end of the mufller may, if desired, be provided with these improvements. Consequently, one or both of these pipes, both pipes in the particular construction shown, extend into the interior of the muf- 55 fler, and these pipes may be welded or otherwise suitably secured to the shell 4, as illustrated at l.

In mufllers of the general type shown in the drawing, it is customary to secure and support the muiller on the ends of the pipes and support the pipes by` brackets or otherwise from the chassis. In such cases, however, the ends of the pipes connect only with the headers, so that the connection is so abrupt or short that considerable strain is placed upon the connections between the muffler and the pipes with the result that the connections soon break from vibration. In accordance with my invention, I provide means within the muffler and spaced from the heads of the muffler and engaging the ends of the pipes, and these means together with the end portions of the pipes are also employed to increase the silencing effect of the mufller. In the particular construction shown, I support the end of the exhaust pipe A by means of a baffle 8 disposed within the muffler at a distance from the head 5 and extending from the end of the exhaust pipe to the housing or other fixed part of the muffler, for example, to the shell 4. This results in a supporting of the exhaust pipe at its end within the mufller as well as at the portion thereof welded or otherwise secured to the head 5. In order to utilize this reinforcing baille to improve the silencing effect of the mufller, I provide means for causing the exhaust gases to flow from the exhaust pipe into an end chamber or space 9 arranged between the baffle 8 and the head 5, and then from this space into the main chamber lll of the muffler. This may be effected in any suitable manner, for example, by providing the baille 8 with apertures or openings ll. Any suitable means may be provided for passing gases from the exhaust pipe into the chamber 9, and in the construction illustrated for this purpose, I provide perforations l2 in the end portion of the exhaust pipe which is arranged within the mufiler. In order to force the gases to pass through the perforations ll and l2 and through the end chamber 9, means are, of course, provided for closing or partly closing the end of the exhaust pipe A. Any suitable means may be provided for this purpose, and preferably I construct the baille 8 with a cap portion I4 formed thereon which ilts over the end of the exhaust pipe A and closes the same. This cap portion I4 may be formed integral with shoulders l5 into which the end of the pipe fits for supporting the pipe on the baille 8. As a result of this construction, the gases passing into the mufller through the exhaust pipe A pass out of the exhaust pipe through Cil the apertures l2 and expand in the chamber 9 and are then discharged through the apertures ll and the barile 8 into the main chamber Il) of the muiller.

A construction similar to that described in connection with the exhaust pipe may be provided at the discharge end oi the Ahier, in which case a baffle l? is provided which connects with the end ci the tail pipe B for spacing the same in lined relation to the shell 5 and simultaneously closing the end of the tail pipe. The baiiie is provided with apertures i8 and the tail pipe is provided with apertures i9, so that gases pass 'from the main chamber iii of the muiiier through the apertures of the baile and into the end chamber 2li, from which they pass into the tail pipe through the periorations I9 thereof.

The construction described has the advantages that when the end portion of a. pipe is supported at two points, as shown, namely, by the baffle and the muffler head, a connection of much greater strength results than when a pipe is connected to the muffler head only. In accordance with this invention. this structure is however further utilized, without adding to the cost thereof, to produce a material increase in the silencing effect, merely by providing the pipe and the balile with perforations or other passages for gases. The baitle thus not only forms a reinforcing or bracing member for the pipe, but also forms an additional silencing chamber in. the muffler.

It will be understood that while the best mufiiing effects are obtained by applying this inven tion to each end of the muffler, yet it will be obvious that even if it is applied to one end only of the muffler, the silencing effect of the muiiier will be materially better than that produced with similar inuiilers heretofore made.

I claim as my invention:

l. A muiiler having a housing including a substantially frusto-conical shell, an inlet head closing the larger end of said shell and a discharge head closing the smaller end of said shell, exhaust and tail pipes extending respectively through said inlet and discharge heads into the interior of said housing, transverse baiiles arranged in said housing at distances from said heads and forming in said housing chambers between said heads and said baiiles and an intermediate chamber between said baiiles, said bal-lies being secured at their peripheral portions to said shell and each engaging one of said pipes at a distance from the adjacent baille and having apertures through which the flow of gases from one chamber to another is restricted, the portions of said pipes between said heads and baflies being provided with apertures and the inner ends of said pipes being closed.

2l A muilier including a housing having a shell, inlet and discharge heads closing respectively the inlet and discharge ends of said shell, exhaust and tail pipes extending respectively through said inlet and discharge heads into the interior of said housing, transverse bafles arranged in said housing at distances from said heads and forming in said housing chambers between said heads and said baffles and an intermediate chamber between said baiiies, said bailles being secured at their peripheral portions to said shell and each engaging one of said pipes at a distance from the adjacent baie and having apertures for restricting the ilow of gases from one chamber to another, each of said bales also having a part which closes the inner end of the pipe which it engages. the portions of the pipes between said heads and baflles being provided with apertures.

LUCIEN L. HAAS.

Cil 

